/*******************************************************************************
 * Copyright 2006, 2017 Jerry Huxtable, Martin Davis
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * This file was semi-automatically converted from the public-domain USGS PROJ source.
 */
package org.locationtech.proj4j.proj;

import org.locationtech.proj4j.ProjCoordinate;

public class GallProjection extends Projection {

	private final static double YF = 1.70710678118654752440;
	private final static double XF = 0.70710678118654752440;
	private final static double RYF = 0.58578643762690495119;
	private final static double RXF = 1.41421356237309504880;

	public ProjCoordinate project(double lplam, double lpphi, ProjCoordinate out) {
		out.x = XF * lplam;
		out.y = YF * Math.tan(.5 * lpphi);
		return out;
	}

	public ProjCoordinate projectInverse(double xyx, double xyy, ProjCoordinate out) {
		out.x = RXF * xyx;
		out.y = 2. * Math.atan(xyy * RYF);
		return out;
	}

	public boolean hasInverse() {
		return true;
	}

	public String toString() {
		return "Gall (Gall Stereographic)";
	}

}
